Create TODO.md

repoSpellCheck: added todo-topics

Author: marcelpetrick

repoSpellCheck/TODO.md

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+# List of potential improvements
+* run codespell in parallel over all fitting files
+* add for codespell some watchdog (timeout 10s?) - in case the check of a single file takes longer, it can be assumed it is either binary or otherwise specail content - maybe even filter by magic number?
+* do a short "review" if a fixing is even fruitful - "two changes" (see git status, etc) are not worth the effort